diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 5abfc6e0..7648873a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -181,13 +181,13 @@ jobs:
       - name: "Prepare UPX for Windows"
         if: ${{ startsWith(matrix.os, 'windows-') }}
         run: |
-          bin/spc install-pkg upx
+          php src/globals/test-extensions.php install_upx_cmd ${{ matrix.os }} ${{ matrix.php }}
           echo "UPX_CMD=$(php src/globals/test-extensions.php upx)" >> $env:GITHUB_ENV
 
       - name: "Prepare UPX for Linux"
         if: ${{ startsWith(matrix.os, 'ubuntu-') }}
         run: |
-          bin/spc install-pkg upx
+          php src/globals/test-extensions.php install_upx_cmd ${{ matrix.os }} ${{ matrix.php }}
           echo "UPX_CMD=$(php src/globals/test-extensions.php upx)" >> $GITHUB_ENV
 
       - name: "Run Build Tests (download)"
diff --git a/src/globals/test-extensions.php b/src/globals/test-extensions.php
index 97f0df8d..9143a207 100644
--- a/src/globals/test-extensions.php
+++ b/src/globals/test-extensions.php
@@ -120,6 +120,9 @@ if ($argv[1] === 'download_cmd') {
 if ($argv[1] === 'doctor_cmd') {
     $doctor_cmd = 'doctor --auto-fix --debug';
 }
+if ($argv[1] === 'install_upx_cmd') {
+    $install_upx_cmd = 'install-pkg upx';
+}
 
 // generate build command
 if ($argv[1] === 'build_cmd' || $argv[1] === 'build_embed_cmd') {
@@ -145,6 +148,7 @@ echo match ($argv[1]) {
     'upx' => $upx ? '--with-upx-pack' : '',
     'prefer_pre_built' => $prefer_pre_built ? '--prefer-pre-built' : '',
     'download_cmd' => $down_cmd,
+    'install_upx_cmd' => $install_upx_cmd,
     'doctor_cmd' => $doctor_cmd,
     'build_cmd' => $build_cmd,
     'build_embed_cmd' => $build_cmd,
@@ -172,6 +176,8 @@ if ($argv[1] === 'download_cmd') {
     }
 } elseif ($argv[1] === 'doctor_cmd') {
     passthru($prefix . $doctor_cmd, $retcode);
+} elseif ($argv[1] === 'install_upx_cmd') {
+    passthru($prefix . $install_upx_cmd, $retcode);
 } else {
     $retcode = 0;
 }